A 52-year-old man with known HIV (CD4 60 cells/µL) presents with fever and cough for 3 weeks. BAL demonstrates Pneumocystis jirovecii on Gomori's methenamine silver stain. Room air PaO2 is 58 mmHg. What is the MOST important adjunctive therapy to add to TMP-SMX?
- A Oral prednisolone 40 mg twice daily for 5 days, then tapering ✓
- B IV methylprednisolone
- C Inhaled pentamidine
- D Oral fluconazole for fungal co-infection coverage
Explanation
In PCP pneumonia with moderate-to-severe disease (defined as PaO2 < 70 mmHg on room air or A-a gradient > 35 mmHg), adjunctive corticosteroids are life-saving and are given within 72 hours of starting TMP-SMX. The recommended regimen is oral prednisolone 40 mg twice daily for 5 days, then 40 mg once daily for 5 days, then 20 mg once daily for 11 days (total 21-day taper). Corticosteroids reduce the inflammatory response triggered by dying Pneumocystis organisms. IV steroids are used only if the patient cannot take oral medications. This recommendation is Grade A, Level I evidence.
Reference: Harrison's Principles of Internal Medicine, 21st ed.
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Written and medically reviewed by the StethoPrep medical team.